Because I bought it from iTunes Store I singed in with my Apple ID so it concerns apple
You do realise Apple doesn't make all the apps on the AppStore don't you? 99% of apps are provided by third-party developers, and it is they who are responsible for the apps, not Apple.
So, if the app you bought isn't providing the service it claims, then you contact the developers of that app.
if it was fake like you said
I didn't say the app was fake. I said the Instagram followers you 'bought' were fake. You don't buy followers. You get them from posting interesting stuff that people want to see, not 'buying' users to follow you.
step aside so Apple representatives will talk to thank you
This is a user-to-user forum ONLY. There are no Apple representatives to talk to you here. Talk to the developers of the app, and if that doesn't get the result you want, then contact iTunes Support directly.